Role of Physical Factors in the Process of Obtaining Copolymers

Polymer Globule as a Nanoreactor

“…In the opposite limiting case, when the reaction proceeds under the diffusion-controlled regime, the so-called "protein-like" heteropolymers are formed. 22 The macrokinetics of such PARs has been theoretically studied in papers. 30,31 Second, in line with ref 21 we considered only homogeneous heteropolymer globules in "volume approximation", ignoring their narrow surface layer.…”

“…This assumption is certainly true, provided the globule is not in glassy state, because the characteristic time scales of the diffusion of low-molecular-weight reagents into the globule are normally far less than the time scales of their chemical transformations. In the opposite limiting case, when the reaction proceeds under the diffusion-controlled regime, the so-called “protein-like” heteropolymers are formed . The macrokinetics of such PARs has been theoretically studied in papers. , …”

“…[8][9][10][11][12][13][14][15][16][17][18][19][20] Its quantitative theory has been developed, 21,22 taking into account the sorption of monomers into the growing macroradical being in the globular conformation state. The basis for this theory is thermodynamic relations connecting the concentrations of low-molecular-weight reagents inside and outside a globule.…”

“…Preferential sorption is of crucial importance in free-radical copolymerization where only its allowance makes possible to explain a number of significant experimental results falling outside the traditional interpretation of the mechanism of this process. – Its quantitative theory has been developed, , taking into account the sorption of monomers into the growing macroradical being in the globular conformation state. The basis for this theory is thermodynamic relations connecting the concentrations of low-molecular-weight reagents inside and outside a globule.…”

Effect of polydispersity on the structure factor of a melt of binary multiblock copolymers with a two-length-scale macromolecular architecture

“…Depending on the value of the modulus of the wavevector q sp of these fluctuations at which the stability loss takes place, trivial (if q sp = 0) and nontrivial (if q sp = 0) branches of the spinodal are distinguished. The equations of these branches for an incompressible melt of arbitrary binary copolymers are [51] (I) χ = χ nt sp , where 2χ Here χ denotes the Flory-Huggins parameter whose value is inversely proportional to the temperature T and p = a 2 q 2 /6 is proportional to the square of the wavevector q 2 and the square of the monomeric unit size a 2 . The function H(p) = S −1 (q 2 ), inversely proportional to the structure factor S(q 2 ) of a melt of ideal macromolecules, is temperature-independent and determined exclusively by the chemical structure of the macromolecules [51]:…”